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NEET levelSingle correct optionDifficulty 1 of 3cc102

For the same metal ion in an octahedral field, which ligand gives the largest crystal field splitting $Δ_{o}$ ?

A $H X_{2} O$
B $F X^{-}$
C $CN X^{-}$
D $I X^{-}$

Answer: C

In the spectrochemical series the field strength increases as

I X^{-} < F X^{-} < H X_{2} O < CN X^{-}

. CN- is the strongest field ligand of the four and gives the largest

Δ_{o}

.

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